skress Posted March 30, 2021 Share Posted March 30, 2021 Hi, I have a Novation Impulse MIDI keyboard. It is setup as a Mackie Designs / HUI / HUI model. In control surfaces setup, MIDI in and out are set to "Impulse HUI". When connecting the keyboard the MIDI out always switches between "no out" and "1 C-2 0". When I play some notes on the keyboard (or on the piano roll), other outputs show up, e.g. "1 D-2 60" and after some time it is back to switching between "no out" and "1 C-2 0". Here is an animated GIF which shows what's happening: Is this normal and expected behaviour? Why is Logic Pro sending output to the keyboard? Thanks Soeren Quote Link to comment Share on other sites More sharing options...
Solution des99 Posted March 31, 2021 Solution Share Posted March 31, 2021 Yes, this is normal behaviour. The HUI mode requires sending a C-2 "heartbeat" note every second or so to confirm the device is still alive. It's annoying, and Logic *should* hide all MIDI traffic on control surface ports and not show it on the display, but this doesn't work for HUI mode, so we have to live with it (unless someone can think of a devious solution.) But it's normal for HUI devices. Quote Link to comment Share on other sites More sharing options...
skress Posted March 31, 2021 Author Share Posted March 31, 2021 Good to know that everything is fine. Thanks for your answer! Quote Link to comment Share on other sites More sharing options...
des99 Posted April 11, 2021 Share Posted April 11, 2021 You're welcome! Quote Link to comment Share on other sites More sharing options...
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